Have you ever paused to wonder why we’re not all drowning in poop? Well, you should. After all, in the United States alone, cows produce 900 billion kilograms of poop per year. In Finland, 1 million cattle produce about 4 billion kilograms of dung per year, enough to make a cube 160 meter high and comfortably bury the Statue of Liberty. That’s just cows. It’s not counting the human waste. Take a moment to imagine how that might pile up.